US4481637A - Arrangement of electrode holders - Google Patents

Arrangement of electrode holders Download PDF

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Publication number
US4481637A
US4481637A US06/464,117 US46411783A US4481637A US 4481637 A US4481637 A US 4481637A US 46411783 A US46411783 A US 46411783A US 4481637 A US4481637 A US 4481637A
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US
United States
Prior art keywords
electrode
clamping means
clamping
feeding
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/464,117
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English (en)
Inventor
Knut Evensen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elkem ASA
Original Assignee
Elkem ASA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Elkem ASA filed Critical Elkem ASA
Assigned to ELKEM A/S A CORP. OF NORWAY reassignment ELKEM A/S A CORP. OF NORWAY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: EVENSEN, KNUT
Application granted granted Critical
Publication of US4481637A publication Critical patent/US4481637A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/06—Electrodes
    • H05B7/08—Electrodes non-consumable
    • H05B7/085—Electrodes non-consumable mainly consisting of carbon
    • H05B7/09—Self-baking electrodes, e.g. Söderberg type electrodes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes
    • H05B7/109—Feeding arrangements

Definitions

  • the present invention relates to an assembly and a method for feeding of electrodes which are used in electro-thermic smelting furnaces.
  • the assembly and the method for feeding of electrodes according to the present invention are intended to be used in conjunction with self-baking electrodes such as conventional "Soederberg" electrodes.
  • the electrode feeding means must further be so simple to produce as possible and it must be easy to perform maintenance work on the electrode feeding means without downtime of the furnace. Further the feeding increment must be easy to adjust and the time interval between each feeding cycle must be easy to regulate.
  • an electrode feeding assembly of this kind imposes relatively large radial forces on the electrode casing and on the electrode itself. With this large radial forces there is a danger for detrimental deformation of the electrode casing and hence of the electrode itself. With the deformation of the electrode casing there is also a danger for totally loosing the holding force imposed on the electrode casing by the holder rings.
  • the feeding increments vary too much for every feeding cycle.
  • the feeding increments can therefore not be used as a safe parameter for the electrode consumption.
  • the furnace have to be shut down for every kind of maintenance work on the electrode feeding means.
  • each clamping means is formed of two substantially identical, reversed parts which are disposed on each side of the outwardly projecting ribs on the electrode casing.
  • the two halves of the clamping means are hinged on a central member and are pressed together by means of a suitable pressure device. Further the electrode feeding units according to the present invention have means to temporary releasing of the pressure on the clamping means. The means for temporary releasing the pressure on the clamping means is preferentially arranged on that end of the clamping means which is remote from the ribs and the pressure device.
  • the pressure on the clamping means can for example be imposed by one or more springs which are tangentially arranged relatively to the electrode.
  • the springs are preferentially furnished with a bolt and nut, which permits regulation of the clamping force.
  • the central member on which the two halves of the clamping means are hinged, is preferentially the piston of a pneumatic or hydraulic cylinder.
  • an electrode feeding assembly which assure safe and controlled feeding of the electrode relative to the electrode holder and at the same time completely or partially, contribute to the holding force for the electrode.
  • the cycle for feeding the electrode according to the present invention is as follows: The pneumatic or hydraulic cylinder for each feeding unit is adjusted to the exact same feeding length. This length is called the feeding increment.
  • the means for temporary releasing the clamping pressure for one of the feeding units is activated.
  • the clamping means is thereby free to be moved relative to the electrode. This is done by activating the pneumatic or hydraulic cylinder.
  • the means for temporary releasing the clamping pressure is reactivated and the clamping means is again imposing pressure on the ribs.
  • This cycle is done for every electrode feeding unit around the periphery of the electrode with a preset time-delay for the activation of every unit.
  • the feeding increment can be easily and exactly adjusted.
  • the normal feeding increment will be about 3 to 30 mm.
  • the time between each feeding cycle can also be regulated.
  • the time interval between each feeding cycle can for example be regulated from about 10 minutes to about 4 hours. With this possibility for regulation, the feeding can be adjusted to the actual electrode consumption.
  • the electrode feeding assembly and the method for feeding electrode according to the present invention will give the exact same feeding increment for each feeding cycle and by counting the feeding cycles it is possible to record the electrode consumption at every moment.
  • the present invention there is arranged a plurality of electrode feeding units around the periphery of the electrode. If for example six electrode feeding units are arranged, ony 17% of the holding force is lost when the pressure on the clamping means for one of the electrode feeding units is released. When the conventional electrode feeding units with two holder rings are used, at least 50% of the holding force will be lost when feeding the electrode. Further, according to the present invention the force on the ribs can be very high without the risk of deformation of the electrode casing because the clamping units impose substantially only tangential force on the electrode casing.
  • At least one unit can be removed without need for furnace downtime and without any risk for uncontrolled feeding of the electrode as only 17% of the holding force of the electrode feeding assembly is lost when one of the electrode feeding units is removed.
  • the electrode feeding assembly according to the present invention can be used for electrodes with highly different diameters.
  • the feeding units are small and occupies a small volume.
  • the height of the feeding units according to the present invention is about 400 mm, whereas the conventional feeding systems have a height of up to 4000 mm.
  • FIG. 1 shows a top view of an electrode with electrode casing and six electrode feeding units, one of the electrode feeding units being shown in detail;
  • FIG. 2 shows a vertical front elevation of one of the electrode feeding units according to the present invention.
  • FIG. 3 shows a top view of one of the electrode feeding units.
  • FIG. 1 shows a top view of an electrode casing 5 with continuous, vertical ribs 6 extending radially outwardly from the electrode casing 5.
  • the electrode casing comprises six ribs 6 extending outwardly from the electrode casing 5.
  • To each rib there is arranged one electrode feeding unit 1. This implies that according to the embodiment of the invention shown on FIG. 1, there is arranged a total of six electrode feeding units 1. The feeding units will be described below in connection with FIGS. 2 and 3.
  • FIGS. 2 and 3 show a preferred embodiment of the electrode feeding unit 1 according to the present invention.
  • the electrode feeding unit 1 comprises lifting/lowering means 8 and clamping means 2.
  • the clamping means 2 is formed of two substantially identical, reversed units which are hinged around a vertical member 3.
  • the clamping means 2 is intended to engage with the ribs 6 extending outwardly from the electrode casing.
  • the electrode feeding unit 1 is furnished with a suitably spring-loaded device 4.
  • the spring-loaded device 4 preferably consists of a helical or a disc spring and a bolt and nut 11.
  • the spring-loaded device 4 is arranged on the clamping means 2 on the same side of the member 3 as the ribs 6.
  • the spring-loaded device 4 is preferably adjustable. According to the embodiment of the present invention shown on FIGS. 2 and 3 the spring-loaded device 4 can be adjusted by tightening or loosening the bolt and nut 11.
  • the clamping means 2 is on the end remote from the ribs 6 and the spring-loaded device 4 furnished with means for temperorary releasing the pressure exerted by the spring-loaded device 4.
  • the means for temporary releasing the pressure exerted on the ribs is a pneumatic or hydraulic cylinder 7.
  • the piston 10 of the cylinder 7 is at its outer end mounted to one of the two halves of the clamping means 4. When the piston 10 goes into the cylinder 7 the two halves of the clamping means 4 will rotate in opposite direction about the member 3 and hence the pressure exerted on the rib 6 by the clamping means 2 will be released. Since the clamping means 3 is free to rotate about the member 3, the clamping means 4 will be self-adjustable in relation to the rib 6.
  • the member 3 is a part of the lifting and lowering means 8.
  • the lifting and lowering means 8 is preferably a pneumatic or hydraulic cylinder 8, and the member 3 is the piston of the cylinder 8.
  • the cylinder 8 is mounted on a frame 9 which in turn can be mounted either on the electrode holder casing or on a suspension frame (not shown). Alternatively, the frame 9 can be mounted on a furnace floor (not shown).
  • the piston 3 of the lifting and lowering means 8 In the normal position the piston 3 of the lifting and lowering means 8 is in its lower position and the clamping means 2 exerts full pressure to the rib 6.
  • the feeding cyclus is as follows: The cylinder 7 for one of the feeding units is activated and the piston 10 moves into the cylinder.
  • the pressure on the rib exerted by the clamping means 2 is then released and the electrode feeding unit is free to move in vertical direction.
  • the lifting and lowering cylinder 8 is then activated and the clamping means 2 moves upwards as the piston 3 moves out of the cylinder 8.
  • the cylinder 7 is deactivated and the pressure exerted on the rib 6 by the clamping means 2 is restored.
  • This cycle is done for every electrode unit 1 around the pheriphery of the electrode, but with a preset time-delay between the cycle for each electrode feeding unit 1. In this way there is only one electrode feeding unit at a time that is not exerting pressure on the ribs 6.
  • the cylinders 8 for all of the electrode feeding units is deactivated at the same time and the electrode is fed down.
  • the electrode feeding assembly according to the present invention can have at least two such units and also more than six, for example 8.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Furnace Details (AREA)
  • Discharge Heating (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Resistance Heating (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Polarising Elements (AREA)
US06/464,117 1982-02-12 1983-02-04 Arrangement of electrode holders Expired - Lifetime US4481637A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO820417 1982-02-12
NO820417A NO149485C (no) 1982-02-12 1982-02-12 Anordning ved elektrode

Publications (1)

Publication Number Publication Date
US4481637A true US4481637A (en) 1984-11-06

Family

ID=19886428

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/464,117 Expired - Lifetime US4481637A (en) 1982-02-12 1983-02-04 Arrangement of electrode holders

Country Status (21)

Country Link
US (1) US4481637A (xx)
JP (1) JPS58184286A (xx)
AU (1) AU542201B2 (xx)
BR (1) BR8300560A (xx)
CA (1) CA1197540A (xx)
DE (1) DE3304099A1 (xx)
EG (1) EG15504A (xx)
ES (1) ES8407641A1 (xx)
FI (1) FI77134C (xx)
FR (1) FR2521811B1 (xx)
IN (1) IN157681B (xx)
IS (1) IS1227B6 (xx)
MX (1) MX159234A (xx)
NO (1) NO149485C (xx)
NZ (1) NZ203256A (xx)
PH (1) PH19448A (xx)
SE (1) SE451525B (xx)
TR (1) TR22137A (xx)
YU (1) YU43150B (xx)
ZA (1) ZA83431B (xx)
ZW (1) ZW3083A1 (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4964114A (en) * 1986-11-26 1990-10-16 Mannesmann Ag Electrode positioning mechanism
US5146469A (en) * 1989-11-14 1992-09-08 Elkem Technology A/S Method and means for continuous production of carbon bodies
US6590926B2 (en) 1999-02-02 2003-07-08 Companhia Brasileira Carbureto De Calcio Container made of stainless steel for forming self-baking electrodes for use in low electric reduction furnaces
US6625196B2 (en) 1999-02-02 2003-09-23 Companhia Brasileira Carbureto De Calcio Container made of aluminum and stainless steel for forming self-baking electrodes for use in low electric reduction furnaces
US7075966B2 (en) 2004-05-20 2006-07-11 Hatch, Ltd. Electrode column

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3737488A1 (de) * 1987-11-02 1989-05-11 Mannesmann Ag Positionieren von fuellelektroden an elektroreduktions- und lichtbogenoefen
ITBG20080017A1 (it) * 2008-04-01 2009-10-02 Piccardi S R L Dispositivo per la regolazione del punto di bloccaggio di un elettrodo

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1928854A (en) * 1930-07-23 1933-10-03 Norske Elektrokemisk Ind As Electrode suspension means
US4154974A (en) * 1977-09-16 1979-05-15 Lectromelt Corporation Clamp for arc furnace electrode

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1068401B (xx) * 1959-11-05
US1892109A (en) * 1931-06-02 1932-12-27 Electro Metallurg Co Apparatus for feeding electric furnace electrodes
GB387585A (en) * 1931-07-07 1933-02-09 Norske Elektrokemisk Ind As Improvements in or relating to electrodes for electric furnaces
DE1440461A1 (de) * 1957-07-24 1969-10-23 Knapsack Ag Vorrichtung zum Halten und Vorschieben von vorgebrannten Elektroden
FR2514981B1 (fr) * 1981-10-19 1985-08-23 Elkem As Dispositif de porte-electrode pour electrodes auto-durcissantes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1928854A (en) * 1930-07-23 1933-10-03 Norske Elektrokemisk Ind As Electrode suspension means
US4154974A (en) * 1977-09-16 1979-05-15 Lectromelt Corporation Clamp for arc furnace electrode

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4964114A (en) * 1986-11-26 1990-10-16 Mannesmann Ag Electrode positioning mechanism
US5146469A (en) * 1989-11-14 1992-09-08 Elkem Technology A/S Method and means for continuous production of carbon bodies
US6590926B2 (en) 1999-02-02 2003-07-08 Companhia Brasileira Carbureto De Calcio Container made of stainless steel for forming self-baking electrodes for use in low electric reduction furnaces
US6625196B2 (en) 1999-02-02 2003-09-23 Companhia Brasileira Carbureto De Calcio Container made of aluminum and stainless steel for forming self-baking electrodes for use in low electric reduction furnaces
US7075966B2 (en) 2004-05-20 2006-07-11 Hatch, Ltd. Electrode column
JP4851444B2 (ja) * 2004-05-20 2012-01-11 ハッチ リミテッド 電極コラム
DE112005001153B4 (de) * 2004-05-20 2016-12-15 Hatch Ltd. Elektrodensäule

Also Published As

Publication number Publication date
PH19448A (en) 1986-04-18
FI830460A0 (fi) 1983-02-10
ZA83431B (en) 1984-09-26
FI77134C (fi) 1989-01-10
TR22137A (tr) 1986-05-20
ES519729A0 (es) 1984-09-16
SE8300575D0 (sv) 1983-02-03
SE8300575L (sv) 1983-08-13
IN157681B (xx) 1986-05-17
SE451525B (sv) 1987-10-12
DE3304099C2 (xx) 1987-10-22
NO149485B (no) 1984-01-16
NO820417L (no) 1983-08-15
FR2521811A1 (fr) 1983-08-19
ES8407641A1 (es) 1984-09-16
AU542201B2 (en) 1985-02-14
JPS58184286A (ja) 1983-10-27
BR8300560A (pt) 1983-11-08
NO149485C (no) 1985-03-05
CA1197540A (en) 1985-12-03
FI77134B (fi) 1988-09-30
JPH033354B2 (xx) 1991-01-18
MX159234A (es) 1989-05-08
FI830460L (fi) 1983-08-13
IS1227B6 (is) 1986-09-25
YU33383A (en) 1986-02-28
AU1120883A (en) 1983-08-18
EG15504A (en) 1986-03-31
IS2781A7 (is) 1983-08-13
YU43150B (en) 1989-04-30
DE3304099A1 (de) 1983-08-25
NZ203256A (en) 1986-02-21
ZW3083A1 (en) 1983-09-07
FR2521811B1 (fr) 1986-05-09

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Owner name: ELKEM A/S A CORP. OF NORWAY

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